Heating device for a wiper blade of a vehicle and wiper blade comprising same

Abstract

The heating device is suitable for assembly with an element (3) supporting a wiper blade and comprises an element of longitudinal main axis (4) suitable for mounting inside a housing (5) of the support element (3) so as to form a spine. A heating element (13) is positioned on a bottom face of the spine-forming element (4). The spine-forming element (4) comprises at least one bushing (20) for the passage of electrical conduction means (19) in order to provide an electrical power supply for the heating element (13).

Claims

1. A wiper blade, comprising: a heating device configured to be assembled with a support element of the wiper blade, the heating device comprising: at least one spine-forming element configured to be mounted inside the support element, and at least one heating element positioned on the spine-forming element, wherein the spine-forming element comprises at least one bushing for the passage of electrical conduction means in order to provide an electrical power supply for the heating element; the support element having a longitudinal main axis comprising: a longitudinal housing, means for holding a scraper blade, and a scraper blade; and a mechanical connector mounted on the support element and configured to link the wiper blade to an actuating arm of a wiping device.

2. The wiper blade according to claim 1, wherein the mechanical connector comprises an electrical connector to which said electrical conduction means of the heating device are linked.

3. The wiper blade according to claim 1, wherein the mechanical connector comprises a hydraulic connector for a washing liquid.

4. The wiper blade according to claim 1, wherein said at least one bushing of the heating device is positioned immediately under said mechanical connector.

5. The wiper blade according to claim 1, wherein said at least one bushing of the heating device is positioned in proximity to said mechanical connector, outside of an area situated under said mechanical connector.

6. The wiper blade according to claim 1, wherein the at least one heating element is positioned on a bottom face of the spine-forming element.

7. The wiper blade according to claim 1, wherein said at least one bushing is situated substantially in a central part of the spine-forming element, in the longitudinal direction thereof.

8. The wiper blade according to claim 1, wherein said at least one bushing is positioned set back relative to side edges of the spine-forming element.

9. The wiper blade according to claim 1, wherein said at least one bushing is positioned on a side edge of the spine-forming element.

10. The wiper blade according to claim 1, wherein two bushings are provided in the spine-forming element, by being spaced apart from one another in a transverse and/or longitudinal direction of the spine-forming element.

11. The wiper blade according to claim 1, wherein two bushings are positioned on opposing side edges of the spine-forming element.

12. The wiper blade according to claim 1, wherein the at least one heating element is a resistive film.

13. The wiper blade according to claim 1, wherein the at least one heating element is a resistive coating.

14. The wiper blade according to claim 1, wherein the at least one heating element extends over an entire width of the spine-forming element.

15. The wiper blade according to claim 1, wherein the at least one heating element extends over substantially an entire length of the spine-forming element.

Description

(1) Other features and advantages of the invention will become apparent from the following description of a nonlimiting embodiment of the invention, with reference to the attached figures in which:

(2) FIG. 1, already described, is an overall view in perspective of a wiper blade linked to an actuating arm;

(3) FIG. 2, already described, is an exploded view of a wiper blade belonging to the prior art;

(4) FIG. 3, already described, is a cross-sectional view of the wiper blade of FIG. 2, after assembly, the heating element being placed on the top face of the spine;

(5) FIG. 4, already described, is a schematic partial view showing the link from the heating element to an electrical connector by conductive wires;

(6) FIG. 5 is a cross-sectional view along the line 5A-5A of FIG. 6 illustrating a wiper blade comprising the heating device according to the invention in which the heating element is positioned under the spine;

(7) FIG. 6 is a view similar to that of FIG. 4 and which shows an embodiment for passing the conductive wires to link the heating element to the electrical connector;

(8) FIG. 7A is a partial cross-sectional view of the wiper blade of FIG. 5 along the line 7A-7A of FIG. 7B;

(9) FIG. 7B is a partial plan view of the spine showing a first variant of placement of bushings in the spine for the passage of the conductive wires;

(10) FIG. 8A is a partial cross-sectional view of the wiper blade of FIG. 5 along the line 8A-8A of FIG. 8B;

(11) FIG. 8B is a partial plan view of the spine showing a second variant of placement of bushings in the spine for the passage of the conductive wires;

(12) FIG. 9A is a partial cross-sectional view of the wiper blade of FIG. 5 along the line 9A-9A of FIG. 9B; and

(13) FIG. 9B is a partial plan view of the spine showing a third variant of placement of bushings in the spine for the passage of the conductive wires.

(14) In the figures, elements identical or equivalent to those already described with reference to FIGS. 1 to 4 will bear the same reference symbols.

(15) FIG. 5 shows a wiper blade 1 comprising a heating device according to the invention in a cross-sectional view along the line 5A-5A of FIG. 6. The component elements of the wiper blade are the same as those of the wiper blade already described with reference to FIGS. 1 to 4 and these elements will not be described again in detail.

(16) The main difference compared to the heating device of the wiper blade already described lies in the fact that the heating element 13 is placed under the spine-forming element 4, and not above it. This gives the advantages of an improved downward allocation and distribution of the heat emitted by the heating element while placing the electrical connector 12 in the shelter of direct heat radiation which could cause an overheating of the connector during prolonged use.

(17) The heating element 13 is advantageously formed by a resistive film which is well protected in the housing 5 provided in the support element 3. Obviously, this does not preclude the use of resistive wires with the same positioning in place of the resistive film or else resistive elements such as stones with positive temperature coefficient.

(18) For the heating element, it is also possible to use a resistive coating in the form of a resistive paint or other coating deposited on the spine-forming element 4.

(19) Now, with this advantageous placement of the heating element 13, there is a problem of connectivity at the electrical link between the heating element 13 which is located under the spine 4 and the electrical connector 12 which is located above it.

(20) According to the invention, this connectivity problem is solved by the arrangement of at least one bushing 20 in the spine 4 for the passage of is the two conductive wires 19, or of other electrical conduction means, linking the heating element 13 to the electrical connector 12.

(21) Given that the width of the spine 4 is relatively limited, of the order of 10 mm, and even if it is possible to effect a single bushing in the spine 4 for the passage of the two conductive wires 19, it is preferable to provide two bushings 20 therein, spaced apart from one another in the transverse and/or longitudinal direction of the spine-forming element 4.

(22) In this way, there is no risk that the conductive wires will provoke a short circuit because of their proximity when they pass through the same bushing in a relatively restricted space.

(23) To limit the length of the conductive wires, the bushings 20 are located immediately under the mechanical connector 10.

(24) FIG. 6 illustrates an embodiment with two bushings 20 positioned spaced apart from one another in the transverse and longitudinal direction and set back relative to the side edges of the spine-forming element 4.

(25) According to a variant that is not represented, the two bushings 20 are aligned relative to one another along a longitudinal central axis of the spine-forming element 4.

(26) FIGS. 7A and 7B show, in a cross-sectional view, respectively plan view, the same embodiment of the bushings 20.

(27) FIGS. 8A and 8B show, in a cross-sectional view, respectively plan view, a first variant of the embodiment of FIG. 6 in which each of the two bushings is positioned on a side edge of the spine-forming element, and more specifically on the opposite side edges thereof.

(28) FIGS. 9A and 9B show, in a cross-sectional view, respectively plan view, a second variant of the embodiment of FIG. 6 in which the two bushings are positioned on a side edge of the spine-forming element, and more specifically on one and the same of the opposite side edges thereof.

(29) The resistive film, which, in the example shown in FIGS. 5 to 9B, forms the resistive element 13, is advantageously fixed directly onto a bottom face of the spine-forming element, for example by a self-adhesive face provided on the film.

(30) The resistive film 13 preferably extends over the entire width of the spine-forming element 4 and over substantially all of the length thereof.

(31) The wiper blade comprising the heating device according to the invention advantageously forms part of a wiping device used on a vehicle.

(32) Obviously, the invention is not limited to the examples illustrated and described, and a person skilled in the art will be able to find variants without in any way departing from the scope of the invention, particularly variants in which resistive wires or a resistive coating are used in place of the resistive film.

(33) It should in particular be noted that the wiper blade with heating device according to the invention may also have no washing liquid distribution device or, on the contrary, may be provided with a dual distribution device, one on each lateral side of the blade. Nor is the presence of an aerodynamic baffle essential for the implementation of the invention.